Gear ratio help
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Gear ratio help
I have a '77 F250 4x4, I believe the truck was originally an automatic, but is now a 4 spd. I blew up the rear end, I broke the pinion shaft. I am trying to determine what rear end i have and what gear ratio so I can find a replacement. There are 44 teeth on the ring gear and 10 teeth on the pinion. I am not sure if it is a dana 60 or 70 and I can't find any tags on it anywhere. Anyone have pics of these two rear ends they can share? Any help is appreciated. Boog
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boogan1, welcome to FTE, you choosen on cool site.
The gear ratio is 44 teeth divided by 10 teeth = 4.4 gear ratio.
Never heard of this particular gear ratio. Check for a gear tag on front differential cover, or rear differential cover.
The rear axle tag will look something like this picture https://www.ford-trucks.com/user_gal...=94739&width=0
The gear ratio is 44 teeth divided by 10 teeth = 4.4 gear ratio.
Never heard of this particular gear ratio. Check for a gear tag on front differential cover, or rear differential cover.
The rear axle tag will look something like this picture https://www.ford-trucks.com/user_gal...=94739&width=0
Last edited by 1975Ford; Feb 22, 2007 at 09:17 AM.
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I am currently 100 miles from where the truck is sitting so can't post the numbers off the vin tags. Sorry. I couldn't find any tags on the rearend anywhere. I removed the rear inspection cover and the pinion gear was layin in the bottom of the housing so I was able to get an accurate count on the teeth on it. I got the ring gear number by reaching as far as I could into the housing, referenced off the center of the spider gear pin and counted half around to the same place on the other side of the pin so basically half the gear, and doubled. If I am off it isn't by one tooth either way, so, 43 teeth or 45 teeth. Boog
Last edited by boogan1; Feb 22, 2007 at 09:11 AM.
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3.54-1; 3.73-1; and 4.10-1 : These are the only ratios available for Dana 60 rear axles from 1973 thru 1979.
Your tooth count is in-correct.
Your tooth count is in-correct.
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I know the count on the pinion gear is correct at 10, my count on the ring gear should be within one or two teeth. I am guessing it is probably a 4.10, can't get any of the three numbers to come out right with a 10 tooth pinion.
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